A kinetic–equilibrium study of a triiodide concentration maximum formed by the persulfate–iodide reaction

Arthur E. Burgess; John C. Davidson

doi:10.1021/ed200055t

A kinetic–equilibrium study of a triiodide concentration maximum formed by the persulfate–iodide reaction

Arthur E. Burgess, John C. Davidson

Research output: Contribution to journal › Article

14 Citations (Scopus)

Abstract

The presence of triiodide, I3–, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I3–]max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I3–]max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.

Original language	English
Pages (from-to)	814–816
Number of pages	3
Journal	Journal of Chemical Education
Volume	89
Issue number	6
DOIs	https://doi.org/10.1021/ed200055t
Publication status	Published - 2012
Externally published	Yes

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Burgess, A. E., & Davidson, J. C. (2012). A kinetic–equilibrium study of a triiodide concentration maximum formed by the persulfate–iodide reaction. Journal of Chemical Education, 89(6), 814–816. https://doi.org/10.1021/ed200055t

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abstract = "The presence of triiodide, I3–, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I3–]max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I3–]max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.",

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N2 - The presence of triiodide, I3–, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I3–]max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I3–]max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.

AB - The presence of triiodide, I3–, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I3–]max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I3–]max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.

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10.1021/ed200055t